Dental tool.



, marines.

FLD STATES FATEN FF.

CERLES H. DAVIS, DECEASED, LATE OF WORCESTER, MASSACHUSETTS, BY BERTHAB. DAVIS, EZECUTBIX, F BOSTON, MASSACHUSETTS.

DENTAL TOOL.

Patented Feb. i8, iigig.

Original application ledvFebruary 2, 1915, Serial No. 5,790. ivided andthis application led November 14, 191'?. Serial Eo. 202,050.

y T0 all whom it may concern:

Be `it known that CHAnLnsH. Davis, de# ceased, a citizen of the UnitedStates, formerly residing at Vorcester, in the County of Worcester andState of Massachusetts, invented a new and 4useful Improvement in DentalTools, of which the following is a specification accompanied by drawingsformi ing a part of-the same, ysaid speciication being a division ofapplication Serial No.

5,790, iiled by said Charles H. Davis on or about February 2,1915.

The invention described herein relates particularly to that class ofdental tools which embody a rotating mandrel and a grinding membercarried by said mandrel for the purpose of grinding, cleansing, andpolishing teeth, and the objects oi my improvement are to provide asimple and in* expensive means for attaching the grinding member to therotating mandrel, and nr securing a yielding action to the periphery ofthe grinding member, by which the latter may be tipped by its pressureagainst a tooth into an angle oblique to the axis of the grindingmandrel. l attain. these objects by the construction andarrangement ofparts as hereinafter described and illustrated in the accompanyingdrawings, in which- Figure 1 is a side elevation of a dental toolembodying my invention.

Fig. 2 is a side elevation shown in longitudinal sectional view.

Fig. 3 represents the diderent parts of my dental tool slightlyseparated from each other, andin position to be assembled.

Fig. 4 is a central sectional view showing a modification of thelgrinding member.

Fig. 5 is a side elevation showing the grinding member tipped at anoblique angle to the axis of the driving mandrel. 4

Similar reference letters refer to similar parts in the diiierentfigures.

Referring to the drawings, l denotes a mandrel adapted to be held in therotating shaft of a dental engine. The mandrel l is provided with aconical tip or head 2 having an axial screw threaded hole 3 to receive`a binding screw Il. 5 denotes a grinding wheel or disk, in the center ofwhich is inserted a flexible sleeve 6, considerably longer than thethickness of the grinding dish 5. ylf'he sleeve 6 is formed of any.suitabl'esoit resilient materiahsuch for example', as soft rubber,

screw t is screwed into place, the two ends of the resilient sleeve 6become expanded, forming IL[langes l0, Fig. 2, by the compression of theresilient sleeve between the cone shaped head 2 of the mandrel and thehead 8 of the screw. As the binding' screw is tightened, the flanges 10,l0, become conipressed between the disk 5 and the cone.

shaped head of the mandrel, and also between the disk 5 and the head 8ofthe screw. Suicient resilience, however, willv remain in the flanges10, i0, to 'allowl the 'grinding disk 5 to be slightly tipped 'hy thepressure .of its edge against a tooth, as shown in Fig.

5. The frictional contact of the Banged ends of the sleeve 6 against thecone shaped head of the mandrel andthe head of the screw will besuiiicient to cause the disk 5 to be rotated by the rotation of themandrel, and

which in the present embodiment is made cone shaped, although a flatdisk attached to the end of the mandrel would provide a suicientfrictional surface t0 insure the rotation of the grinding disk. Theamount of resilience remaining in the iianged ends 0f the sleeve 6 mayreadily be determined by the force with which the flanges areconipressed, a slight compression giving the .greater resilience.

In Fig. 5 a tooth being ground is represented at 11, and the grindingdisk 5 is represented as being tipped at an oblique angle to the axis ofthe mandrel 1 by the pressure ics ing odisk. Y

3. In 'a dental tool of the class described,

of its periphery against the side of the tooth.l This ylelding action'ofthe grinding disk is permitted bythe resilience oi the iianges l0, theianges being comptessed on one edge and expanded by their resilience onthe opposite edge.v

In Fig. i a modification ,is shown inthe fermv of the grinding diskrepresented as cup shaped, as at 12'. In the construction of my improveddental tool, I cheapen the construction by inserting the Istr-aight-resilient sleeve 6 through the center of the grinding dlsk 5, as showninFig. 3, andI form the flanges 10, 10 as shown in Fig. Q, by thecompression of the resilient sleeve between the coneshaped head of themandrely and the head 8 of the. binding'screw. It is obvious. however;that'y the same yielding action. of the grinding disk as illustrated inFig. 5' would be secured if the resilient. sleeve were formed withflanges 10, lO', before it was inserted in the grinding disk 5. The useof the straight sleeve 6 is, however, the pr ferred embodiment of myinvention.

1. .In a dental tool of the class described, a rotating mandrel, agrinding disk having a central hole, a resilient sleeve of greaterlength than the thickness of the disk inserted in said central hole, a.binding screw yengaging a Screw threaded axial hole in said mand-rel andhaving a head overlapping-the end of said resilient sleeve, whereby theends of said sleeve arefflanged'upo the opposite sides of said grindingdisk.

.2. In a dental tool of the class described, a rot-ating mandrel, agrinding disk and means for attaching the grinding disk to said mandrel,comprising a lresilientsleeve inserted in the grinding disk, and ofgreater iengfh than the thickness ofthe. disk, .and means forcompressing the ends of said resilient sleeve, Wherebyresilient ianges`are formed upon opposite' sides of the grind-l a rotating mandrel, agrindingy disk having a central ole, a lsleeve inserted inv saidgrinding disk provided .at its ends with resilient iianges overlappingthe sides 'of .said mandrel.

Lasagne the grindingdisk, and means for binding said sleeved grindingdisk upon the endlof 4f.' In a dental tool of the' a grinding disk,- abinding screw engaging for binding the disk against the end et hemandrel` a resilient member between'the end of the mandrel andthegrinding disk,

and a second resilient member between the grinding disk and said bindingmember, whereby the ldisk is permitted to assume an oblique positionrelatively to the axis of the mandrel by the compression of saidresilient members.

' 6. A grinding disk having a central opening passing entirely throughthe same,.and

a "soft removable yieldable center core secured in said opening.'

7. A grinding disk provided with a` removable rubber center core. l

8. A grinding disk having a central open. ing and a yieldable centerVcore provided ,with 'a central hub adaptedto have holding engagementIwith said opening, yand further vprovided with side flanges adaptedvtoenclass described, l a rotating mandrel having an enlarged tip or headand an laxial screw threaded hole gage the opposite faces of said disk,wherebyv saidl core is removably4 secured' to' .said disk.

'9; As a'nevv article of manufacture, a soft yieldable center core forgrinding disks, comprising an apertured central hub providedwithin-tegral positioning end'iianges.

i BERTIIA B. DAVIS, Eeouzre'fv of Charles H.' Dars, deceased.

AIi'vitnesses lliinesnnr L. FERRIN, .SAMUEL lll.v CANFIELD.

